Tempering process.



A. M. CHASE.

TBMPERING PROCESS.

APPLICATION FILED AUG. 24, 1903. RENEWED JULY 28, 1911. 1,091; 20, Patented Mar. 24, 19m

2 EEEETB-SHEET 1.

WITNESSES: INVENTOR {ATTORNEYS A. M. CHASE.

TEMPERING PROCESS. APPLICATION FILED AU-G. 24, 1903. RENEWED JULY 28, 1911. 1 Q91,1 20 Patented Mar. 24, 19m

2 SHEETS-SHEET 2.

WITNESSES:

- BY S ATTORNEYS 1 UNITED, STATES/PATENT OFFICE. a Anaheim. cnasn, or synhcosn, new 151:, Assiefioaro, s znacios'ii .eninnnn PLOW COMPANY, or sYaacusr, nun/Yemen conroaarron or new aroma madame PROCESS.

he I v I I I. 1,091,120, 7 I Specification of Letters Patent. Patented Mar, 24,, 1914, Original application flied min 7, Isa 8, Serial No. 708,071. Divided and this application filed August 21:,

- i 1808, Serial No. 170,575. Renewed July 28, 1811. Serial No. 641,178.

To all whom it may concern:

Be it known that I, AUmN M. Simon, of Syracuse, in the county of Onondaga, in the State of New York, have invented a certain '5 new and. useful Tempering Process, of

which the following is a specification.

My invention relates to tempering proc-, esses, particularly suitable for carrymg out by the apparatus set forth inv U. 8. Letters Patent, N 0. 737079, dated Aug. 25, 1903, of the application for which patent this ,case is a divisional part, and has for its object a tempering process which enables the user to temper with great uniformity and in a minimum space; and to this end, it consists in themanner of treatment hereinafter specifically pointed out and claimed.

In describing-this invention, reference is' had to the accompanying drawing, in which like characters refer to corresponding parts in all-the views. 4 Figure 1 is a;plan view of the apparatus for carrying out my process forming the subject-matter of said Patent No. 737079. ilgig. 2 is a sectionalv view taken on line 22,

%t is well known to those skilled in the art, that it is exceedingly d-iflicult, even for workmenof the greatest skill and expert- 30 ness, to secure uni-form results in successively tempering a number of articles for the reason that the fluid in which. the articles are inserted when being tem red absorbs heat therefrom and is grafilly heated thus effecting variation in the tem- 'pering of said articles.. Indeed-the securement of uniform results in tempering isso diflicult that in practice a considerable portion of a number of articles successively tempered by even expert and skilled laborers must .be retempered, thus necessitating reheating of the metal and additional labor and expense, and causing the metal to become less suitable for the desired purpose.

45 It is also wellknown that for the purpose of securin uniform results in' tempering and requirlng less heating of the articles to be tempered, it is customary to place ice within the temperin fluid and to. also employ a number of tan s, ,or other receptacles,- for, said fluid. When ice, is, used the com:

- pastas-northeiii' Militia??- ally varied as the ice melts, and ununiformrity 1n tempering results. H Moreover, if ice is used, even n large quantities, the tempera- .ture remains constant for a comparatively short tlme only. The use of a plurality of tanks or receptacles containin tempering fluid also fails to add'materiafiyin efi'ectmg umform tempering, since the temperature of the fluid in the receptacles is more or less variable and rises quickly as soon as tempering is commenced, especlally whenthe size of the articles tempered is relatively large and the temperature thereof high. oreover, considerable space is occupied by the various tanks or receptacles, and the means for supporting the articles to be tempered must 'be' capable of use at several points, or means must be provided for conducting the tempering fluid rom one tank or receptacle. to another, which would not be necessaryif' a single tank or receptacle were sufliclent. By my process, a minimum space is required for tempering, and the tempering fluid is maintained substantially unif orm in composition and temperature.

The illustrated apparatus for carrying out --my process consists of a receptacle for refrigerating mechanism provided with a conduit. arranged within the receptacle, and with means for passing an e'xpansible refrigerating fluid through the conduit. -Said receptacle is-composed of chambers A B arranged side by side, the chamber A containing a tempering ,pool, being open at itstop for admitting the articles tobe tempered and being provided with an inlet-o ening 'w in the lower portion of its side a a jacent to the chamber B, and with an outlet-openin ain the upper portion o foone of the si es a arranged at an angle with the side a. The chamber cools the heated tem- ,pering fluid and is provided with an inlet B for'th'e fluid, a lateral bran '6 communicating with the outlet-open? g a of the chamber A, and a tortuous passage 6' com municating at one end wit the branch 6 g Q -th c a ber e--....a-. yolubl r ifeless-mi 0 effects aposltwe c'irc'ulfitihn respective tanks or ceiving the tempering fluid or liquid and thearticles to be tempered, and an artificial reand at its-opposite end withthe inlet op'en pressor or pump, condenser, receiver and conduits for circulating an eXpansible-re-- frigerating fluid through said conduit. The construction of the compressor or pump D, condenser D, receiver D and the connections between said parts, forms no feature of nay-present invention, and, consequently, it is unnecessary to describe the same. Said conduits D are supported within the branches of the tortuous passages b in the path-of the tempering fluid passing therethrough.

In following out this process, the refrigcrating mechanism constantly or intermitlently maintains a lower temperature within the refrigerating conduits D than that of the fluid or liquid circulating around said conduits. The temperature of-said fluid is thus reduced, and if desired, ice is formed upon the exterior of the refrigerating conduits. The cooled tempering fluid is admitted to the lower portion of the tempering pool, the articles to be tempered are momentarily inserted into said pool through the opening in the top of the. chamber A, and are then withdrawn and the upper surface of the tempering pool is removed and passes through the chamber containing the refrigerating conduits. Said tempering fluid within the chamber A for receiving the article to be tempered may be maintained at any desired temperature, and, consequently, users of my apparatus may temper uniformly. Maintenance of the tempering fluid or liquid at a constant temperature is greatly facilitated by first forming ice upon the refrigerating conduits within said liquid and then causin the refrigerating mechanism to abstract sufficient heat from the liquid to prevent'melting of the ice irrespective of the masses and'temperatures of the articles being tempered. 1t will be apparent to those skilled in the art, that as the tempering pool should ordinarily be maintained at a temperature considerably lower than thatof the atmosphere and preferably a few degrees above or below freezin point, it is necessary to abstract from the tempering liquid more heat than imparted thereto by the article momentarily immersed therein, since more or less heat is imparted. to the temper- Therefore,

ing fluid by-the atmosphere. ordinarily, my process includes abstracting from-the tempering fluid a greater amount of .heat than imparted thereto by the 'arti cles to be tempered.

Having thus fully described my invention, what I'claim as new and desire to secure by Letters Patent, is

1. The herein described process for maintaining a fluid tempering bath substantially uniform in composition and temperature, and such temperature at approximately the freezing point of water, consisting in confining the bath in a container, disposing a minor portion of the bath in the form of an unobstructed poo-l for the reception of the articles to be tempered, and constantly circulating through a major portion of the bath, located outside of said pool, an expansible refrigerating medium, substantially as and for the purpose described.

2. The herein described process for maintaining a fluid tempering bath substantially uniform in composition and temperature, and such temperature at approximately the freezing point of water, consisting in confining the bath in a container, disposing a minor portion of the bath in the form of an unobstructed pool for the reception of the articles to be tempered, constantly circulating through a major portion of the bath locatedoutside of said pool an expansible refrigerating medium and ing the fluid of the entire ath, substantially as and for the purpose specified.

,3. The herein-described rocess of temperin metallic articles, wiich consists in providing a bath of liquid, circulating an eX- pansible refrigerating medium theret-hro-ugh to form ice within the bath, immersing in ositively circulatsaid bath the first of a series of articles-to" be treated. maintaining a sufiicient circulation of refrigerating medium to counteract the heat given off 'by the article under treatment'and the heat taken from the surrounding atmosphere, removing the first artiole immersed from the bath, and then immersing'in the. bath another article of the of Onondaga, in the State of New York,

this 22nd day of August, 1903.

y AURIN M. CHASE.

lVitnesses:

1S. DAVIS, F. E. .WILCOX.- 

